Expected MultipartHttpServletRequest: is a MultipartResolver configured解决方案

异常信息：

　　java.lang.IllegalArgumentException: Expected MultipartHttpServletRequest: is a MultipartResolver configured?
   at org.springframework.util.Assert.notNull(Assert.java:115)
   at org.springframework.web.method.annotation.RequestParamMethodArgumentResolver.resolveName(RequestParamMethodArgumentResolver.java:168)
   at org.springframework.web.method.annotation.AbstractNamedValueMethodArgumentResolver.resolveArgument(AbstractNamedValueMethodArgumentResolver.java:90)
   at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:78)
   at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:162)
   at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:129)
   at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:111)
   at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:806)
   at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:729)
   at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)
   at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:872)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
   at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
   at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
   at org.apache.catalina.filters.CorsFilter.handleNonCORS(CorsFilter.java:436)
   at org.apache.catalina.filters.CorsFilter.doFilter(CorsFilter.java:177)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
   at org.ajaxanywhere.AAFilter.doFilter(AAFilter.java:46)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
   at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:85)
   at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
   at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
   at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
   at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
   at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
   at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)
   at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)
   at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
   at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
   at java.lang.Thread.run(Thread.java:745)

解决办法：

引入包commons-fileupload-1.3.jar，版本号可以根据项目情况调整；
在spring mvc配置文件中增加配置，文件大小限制可根据项目情况调整：

<!-- 上传文件拦截，设置最大上传文件大小   10M=10*1024*1024(B)=10485760 bytes -->  
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
    <property name="maxUploadSize" value="10485760" />  
</bean>